Do the UCam247 IP cameras support 2.4GHz and 5GHz WiFi?
No. Only 2.4GHz.
You will find most IP cameras are only designed to connect over 2.4GHz Wireless because this offers the most stable WiFi over a longer range.
5GHz is faster but works over a much shorter distance and is more affected by walls and other obstacles between camera and WiFi router. So for use with IP cameras is much less suitable, let alone practicable.