Can i fit an electric mat heating above the wet pipe system?

[Pete]

When I laid the wet UFH pipes in our concrete slab I put a loop in both bathrooms. Now I am hoping to put an electric mat under the tiles above the wet pipe system unless the collective say otherwise. Like some I am hoping to have a subtle background heat (electric)from the bathrooms to heat the house before we go full wet pipe but not sure if this is ok above the wet pipe system. TIA