Proliant DL380 gen9 (sku num. 752689-B21) drive bays

[ftaurino]

Hi all,

I've a DL380 gen9 server, sku number 752689-B21, with a P440ar controller, SAS expander card (727250-B21) and with bay 1 and bay 3 each with 8 sff hard disks (2 TB - MM2000GEFRA), 16 in total. I'd like to buy the bay 2 cage (768857-B21) with 8 sff 2 TB hd (765455-B21), but I'm not sure if this type of upgrade is technically possible or supported. 
Please, give me some advice for doing this.

Many thanks,

Francesco