para sa ganito, di lang capacity ang titingnan mo pati rin ang sustained delivery - power or current rating na kayang i-sustain. i know xiaomi and cuktech (pretty much the same company) have good ones, but i've never used them.
also consider that you would also have to protect your connectivity (router, access points, switches) from interruption, baka mas ok kung UPS?
bitin pa ba runtime ng laptop battery? kung kaya ng budget, mobile workstations will run on battery for a whole work day. presyo lang nagkakatalo pero kung pang-hanapbuhay, it could be something to consider.