Tacx neo 2 shimano 105 disc caliper touching silver part of neo 2

I've just bought a Neo 2, fitted the shim and the correct through axle adapters from my 12x142 spec bike. The Shimano 105 caliper is touching the silver part of the trainer.

I can't believe that this is acceptable. I've loosened the caliper and there is movement away from the trainer but when tightened it will still touch the trainer.

I'm considering sticking something on the trainer to prevent rub as I wouldn't be happy having the caliper loose when I'm using the trainer.

Is there a better fix? I'm considering sending the trainer back and getting a wahoo as I expected the set up to fit perfectly without any bodging.