Anyone using Unifi Air with those cheap USB modems from Lazada/Shopee?

Saw a few good deals with the relevant bands (5 / 38 / 40) for below RM 100.

Considering getting one since I only need it for around 2 months

Also, anyone using the Air sim via a phone? I asked at a TM Point store and they said Unifi Air doesn't allow it and will block access if the sim is detected on a phone..