Yes, I did that in my old house - up/down three stories and into the basement. Good fun threading through a 3ft gap between two floors - had to mount two drill bits on top of each other and then use a long wire hanger.
OK, I'll revert to GB E'net for any transfers.
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Thanks. I'll try pass through mode, haven't had a go at that. All devices are on the same net anyway. I referenced the drive formats as I had read that Target Disk Mode only worked when both are APFS, but since it doesn't seem to work at all, it's irrelevant it seems.