Check two things:
1) How does it handle master + slave? will it occupy the slave position regardless if it's used elsewhere? Otoh, some creative re-routed P-ATA pins could solve it.
2) How is termination dealt with? signal path stubs are bad news.
Regarding master/slave there's also the "cable select mode" which is however rarely used. The ATA standards is a piece of a really bad example of engineering on what not to do. Guess why Commodore choosed SCSI
