I just put my PC desktop computer and large studio monitors in bubble wrap in large suitcases. Two suitcases and a Carry-on. It depends on the airline. You may have to pay extra fees but I am glad I did it that way instead of shipping. For musical instruments or DJ controllers you should be able to carry on or they can stow away in special compartments designated for musical equipment. It really depends on the airline.
It depends on your condo. Some have an exclusive contract. Best way around this is to use AIS 200 bhat a month unlimited on your phone for video calls and the AIS 4G pocket wifi that cost 2345 bhat in total - you keep it for 12 months for everything else. Otherwise, you need True for like 700 bhat a month for faster speeds with full router and wifi to handle video calls and online gaming.