The router supports up to 4 SSIDs per band. So you can assign WiFi SSIDs to a maximum of 4 VLANs per band. If you want to use all 5 VLANs for WiFi, then some VLANs will be available for one band only. For example, you can have LAN, Guest, X1, X2 for the 5GHz band, and then LAN, Guest, X1, X3 for the 2.4GHz band.