Hot-swap HD question

Looking at buying a new desktop PC and would like to configure the tower case with hot swappable, trayless HD slots. I assume that a device such as this would be what I need?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817998020

Also, given I'd like to add multiple slots, I'd have to know how many open eSATA ports the case has, but that's not a spec I generally see on the main vendor type sites. (?)

Any general advice/comments on going this route appreciated.