When artwork is coming in direct contact with the wood of the rebate, such as with a stretched canvas, i always like to line the rebate. There are conservation tapes made specially for this purpose. In this case, i’m using Lineco Frame Sealing Tape, which is alluminium and archival, there are also foam tapes. I often insert a strip of velvet into the rebate to prevent damage to the canvas face. Z-clips are a big no no.