My neighbour bought the M8S, I've tested them, run smoothly, didn't hear any complaint from him since buying a week ago

Hi, due to criteria 2, your best bet for suggestions would actually be the garage section and directly deal with sellers who offer pre-installed apks with TV channels subscription packages.

Oh no!
That criterion is extremely impt.
Unless u already know androids, boxes and have the knowledge and expertise.
If newbie, u will need help to pre install, maintain and add new stuff.
These boxes are software driven, not like axtro or dvd boxes that are hardware driven.

Some of us here can deal with any new android box or phone or tablet.
But that took time, patience, curiosity and practice.