The only thing to watch out for using a laptop that is plugged in 24x7 is the battery. Battery management systems are generally pretty good, but Li-ion batteries can fail catastrophically. As long as you make a point to check on it periodically it’s probably fine.

I’m using an old laptop as a local interface for my network setup, since its in my basement, and I actually pulled the battery out entirely since I have a beefy UPS powering everything. Paranoid, maybe, but a Li-ion battery sitting on top of my equipment rack could do a ton of damage if it were to fail someday.