knock yourself out if you want to hit topspin volleys. My opinion is it is a waste of time. Volleys are hit with a conti grip which is not conducive to top - yes, it can be done but not best fit. Also, you don't have much time at net and I think a bit of underspin with a conti grip is a quicker more compact stroke.
My opinion is the only time to even consider top on a volley is for a mid-court high swinging volley but I personally don't even use this shot as I prefer to hit traditional volleys.
But, to each their own. Try it you might like it but not for me.