Multiple passes is pointless - all you need is 1 pass.
Typically to wipe a SSD, you do a blkdiscard, then do one complete overwrite with 0 and then do blkdiscard again and that's the best you can do.
The only issue with 0's is that the SSD software could detect that you're overwriting with 0 and not actually erase anything - so a single pass of random bytes may not be a bad idea.
