METV from a country you are a legal resident of. You won't get denied entry as long as you can provide proof that you are a genuine traveller. Never mention that you are working online. You can say you have an online business though.
Having a business does not mean you are working for that business if it's at a stage where you just receive the profits from it.
Air is unlimited but you might attract a lot of attention of you are staying for the maximum time possible and going in and out on multiple visa exempts