There are games that you can play sitting at your desk to be honest.
But for the more full motion ones, as long as you can control yourself, then you're fine as long as you have a place you can stand where your reach (standing still) is clear of obstacles.
I've been very pleased with my Rift. I don't think I'll upgrade to the Rift S, but if I was buying now I'd probably pick it for the higher resolution and not needing any external sensors.
On the subject of resolution, the only games I have played on the Rift where it's particularly noticeable are racing games - when you're looking towards a distant corner or road sign, it's rather pixellated. But I've noticed no issues in any other game type.
Some of the experiences you get in VR are jaw dropping, and I'd highly recommend it.