Can you use M.2 SSD for Roon Library?

An info.
I’m looking for a NEW NAS, and my 2 options now are the qnap 453, or the synology 918+.

In this Qnap, can you use the Slot SSD M.2 (via adapter) to install an SSD and use it for the roon library? In the synology, i’ve read that the SSD M.2 is just for cache.

as far as i understand, who has roon core installed on a NAS use an additional SSD connected via USB3 for the roon library.
thanks