Mergerfs questions...best way to expand my pool

Hi,

I plan to build a new machine with OMV on it so i can use mergerfs. I already have another box with mergerfs running and a pool of 25TB. This is for plex/sonarr/radarr/sickrage

So im wondering what is the better option?

1 - Create a new pool with mergerFS and add that pool as a root in all my apps
2 - Share each drive via NFS to my other machine and add those shares to my current mergerfs pool
3 - Can i create a new pool, share that pool with my other server and then add that share to my current mergerfs pool?

Pro's and con's of each?

Thanks