There is XMP in the BIOS hidden menus.

That said, dont waste money on XMP RAM, much less on off-brands like Teamgroup..

Get two JEDEC sticks of DDR4 3200Mhz RAM and it will be plug and play.

Grab 2 of these:

https://www.amazon.com/Crucial-16GB-Laptop-Memory-CT16G4SFRA32A/dp/B08C511GQH

Ended up going with this after I was informed that the framework doesn't support xmp profiles. 16gb is perfect for what I need and I spent $68.45, which is cheaper than the $80 framework charges for 16gb of ram on the diy model.

I'm getting the same unit and didn't know about ram but found this after I saw your question, he may answer and have a better solution. https://mariushosting.com/synology-which-ram-to-buy-for-ds920-nas/ (not my site)

Edit: found this about getting to 20GB https://www.reddit.com/r/synology/comments/p670yd/ram_upgrade_works_with_ds_920_now_20_gb_ram/

and this 8GB on sale on amazon for $29 normally $49 if you just want to get to 12GB that was tested as working to 12GB (4GB onboard that can't be removed) https://www.amazon.com/Samsung-2666MHz-Memory-Laptops-M471A1K43CB1/dp/B07JWG53DG (while these are not on sale, they are $55 normally on amazon https://www.amazon.com/Crucial-16GB-Laptop-Memory-CT16G4SFRA32A/dp/B08C511GQH) and cheaper on Newegg https://www.newegg.com/crucial-16gb-260-pin-ddr4-so-dimm/p/N82E16820156262 and slightly on sale also for $37