SSD recommendation & raidz vs mirror

I want to test PBS to backup 18Tb of VM’s (on proxmox ve). What kind of SSD’s would you recommend?

Buying enterprise SSD’s is quite expensive and maybe consumer grade ssd’s are fit for these kind of backups? After all it’s only sending incremental changes, right? What do you think?

I also wonder if we need zfs mirrors or if raidz is fine too? With ssd’s maybe raidz-1 ( or better raidz-2?) is okay?

Thanks