No the left hand is doing the muting as it supposed to be a short ghost notes. If you are doing left hand tapping then it depends. But usually you don’t tap and slap until your Kung fu is way up then it doesn’t matter, lol.
When you slap with the left hand it really helps to have:
Nice low action so the strings will slam against that fretboard without you having to do too much heavy lifting.
Burly, high output pickups that will take every sound you make and keep them strong
Really strong Kung Fu style.
The fretboard strike is a lot like the thumb strike - it has to be quick, and loose. You have to let that hand bounce off the strings, like the thumb does… but - the tricky part - you can’t bounce off all the way or it will just ring.
My solution to this is to leave my index finger over the strings and to strike that fret-hand mute with my other three fingers. That way I don’t get the open string ringing out.
When I was just going through tunes where that technique is used, that’s what my hand is doing most often.
I am very tired, so I’m not sure if this is making any sense.
I hope it is!