First-timer with a full Mars Hydro setup (TS 1000 & 80x80x160 Tent)

Depends a little bit on the goal you have with that scrog net i would say. You could either use a net to give stability to buds and prevent them from flipping over, or use it to keep a low canopy and cover it with foliage as quickly as possible. Looks like you want to keep your canopy low, so i suggest you install the net now and use it to do more light stress training. You can still raise it higher later, it can be a little bit tricky but defnintely possible. Get somebody to help you to make that easier. Or install a second canopy on top of that later. Ive seen people using 3 layers of those nets with insane results. But you should be fine moving that net around later i think! Keep it simple, keep it smart!