Also forgot the email newsletter/X percent off pop-up

I took a look at Nextcloud and really like it from a usability standpoint.

My question is what would my hardware options be? A form factor like the off the shelf NAS units is ideal since they will have to go on shelves next to the routers. If it was just me, a server rack would be fine, but I gotta keep it clean looking and on the smaller side. Also, I would like to keep the hardware price per house not much higher than the $300 range (excluding hard drives).