It’s very important to understand the RUTX50 does NOT support 802.3af or 802.3at etc type standard which is 48+ volts. RUTX50 POE only supports passive 24 volt. You should have read the RUTX50 Powering Options
There are no issues powering the RUTX50 from a Network switch with Passive 24 POE. Ubiquiti is but one manufacturer that makes passive compatible switches. Ubiquiti also make POE adapters, small boxes the size of a cigarette packet, power in one end, two(2) ethernet ports other end, one as POE and one LAN port. POE port to the RUTX50 (LAN 1 only), LAN port to the other network device, Laptop, PC other network switch etc