There is a clear distinction between PSU and simply electrical hardware actualy.
PSU must have the CE logo but electrical hardware powered by less 50v doesn't
https://emcfastpass.com/could-your-product-be-exempt-from-emc-testing-altogether/

As a result, if you buy only the miner it is not subject to CE marking as it's doesn't have a PSU.
If you buy a PSU from bitmain and it has the CE marking, you are safe. Just check with Bitmain or other people on the forum who purchased a PSU from bitmain to check if the PSU has the CE marking.