Yep, you can install those kind of apps and you can also install apks. But some apps may not be optimized for be used with the remote control.
X94k? What is that model? Heard of the x95k, but not that one? Specs?
Google TV is fully Android friendly. APKs and Dev Mode aren't an issue
Yes. you can download the apps through playstore. I suggest you to install iptv smarters pro or TiviMate then select to connect with xtream codes section. Myself i'm using the service from ( moulip tv. com ). I've used quite a few different services over the years but this is by far the best I've ever used. No buffering No issues. Fast and easy set up process.
Absolutely! You can download apps from the store, as well as sideload all kinds of apks through unlinked, filesynced, applinked, etc. There's many more stores as well, if you get stuck, PM me and I'll walk you through it. Have a great night!😎