I have to say this - in my opinion you may be wasting your time. In times foregone, getting the metadata.db onto a faster device may have had some mileage, but I'm not sure that's true today.
When I got a Samsung 500GB Nvme M.2 system drive in In Q3 2017, I moved my Books library (120,000+ books) onto it just see what difference it made. The start up times dropped from 7-10 secs to 3-5 secs - nothing else changed, sorting and searching were just as fast as they when the library was on a 2 TB WD Caviar Black drive, adding books, conversions etc were about the same (Temp is on the SSD).
So I moved the library back to the HDD. i don't like having data on the same drive as the OS - and at the time I wasn't inclined to partition the SSD for an extra 5 secs once or twice a day
BR