Some are saying that newer streaming devices give you the ability to download VPN apps... don't own any of the newer generation devices or have any presently attached but know from the past that the VPN apps like ExpressVPN and Nord are for a fee ($) apps. For services like Netflix and Amazon you will get whatever limitations or restrictions are in place for the geo location your VPN is set to... that means if you are setting VPN location to Thailand you only get thai content, UK will be UK content, USA will be USA content. Netflix (I believe Amazon as well) has a very sophisticated algorithm and blocks know VPN IP addresses. Some VPNs will not achieve the geo location change you may be looking to overcome. Also keep in mind that the VPN overhead to bandwidth may have an affect on your streaming stability.
this may not be a capability that your router has... really depends on your router and if you have admin rights/access. There are some "appliances" that you can buy that could allow you to create a VPN or VPN like environment between your internet connection and your streaming device BUT you will likely suffer additional bandwidth reductions that may make your streaming experience frustrating. Higher end "prosumer" routers like Ubiquiti and Mikrotik... allow you to specify VPN per connection. These type of devices have a learning curve and require some networking technical expertise. Best advice I can give is find someone that you trust (this person will need to have access to your home internet) that can give you some networking advice.
If you are trying to bypass country/regional restrictions you will need a VPN. Netflix has a pretty sophisticated algorithm that can identify most commercial VPNs so if you are looking for US content having a private VPN server is the reliable solution... set up a server at your US home, or a family or friends home. The downside is that your bandwidth VPNing to the US is severely impacted and you may see some buffering issues.
For your firestick, chromecast or roku to use a VPN you have to set it up on your router. The downside is that your whole house is then routed through the VPN and your internet is subject to the "restrictions" of your VPN, speed of connection and any VPN location specifics. If your VPN is to a server in the EU your internet will route from Thailand to the EU and back. If there are country specific restrictions you will be subscribed to those restrictions while the VPN is turned on.
I have lived internationally for the last 10 years... I have watched from afar my country and the extreme attitudes toward muslims, latin americans, asians... so much hate that most of the haters don't even understand why they hate they just follow the crowd or the cult that they find themselves associated with. So many ignorant people that are so easily led to conclusions and conspiracies that are unfounded and serve no purpose. Most are pawns in someone else's desire for power and for money. So they come to forums like this and lash out because it makes them feel more HiSo than the life they have been gifted by the masters. They claim to be religious or intelligent but cannot recite a verse, perform a beatitude, or critically examine their own life let alone contribute or help someone else. They attacked you and they will attack me for writing this because it will strike a nerve and rather than repent they will feel better because they responded with anger rather than love. Their response is a testament to how far they have strayed from the basic nature of being a good human and showing any empathy for other humans. To all of them I say, Bless your hearts!
I hope the admins take note and at the very minimum warn some of these disgusting people that create conflict with their useless and distasteful comments. How about learning where the scroll button is!!! Your keyboard access need to be suspended!!!