Problem and possible stumbling block is that our tvs have neither HDMI nor USB port, they are a little older, too

Soo, what kind of box should I go for? Some kind of Android tv box, e.g. somehing like this? Or a Roku-box? It should be able to do Hulu, Netflix and YouTube, ideally work with a network cable (we have wifi, but it's already clogged up pretty well, so I'd rather hook it to a copper- than an air-wire, if possible). Japanese is fine, it is mostly for wifey

I am a bit lost here and would appreciate some pointers in the right direction, tv is not my world anymore.