At least have one start on the table that way you have alternating pie plates. Otherwise, your opponent need just simply hide in cover on turns 2, 4, and 6.
Your really not gonna get positive feedback regarding them, they are not that popular but they have a role on the table. Too pricey for an average of 3 AP2 pie plates in a game for a single Mawloc, then there is scatter and cover saves, so not really that great of a unit as they can be easily avoided to decrease damage dealt.
They kinda suck in CC, no scything talon re-rolls although they have them physically, just not in their profile, and they have a low amount of attacks, so you would be lucky to assault a moving vehicle and get 1 hit at St7 with Adrenal Glands, but +2d6 helps for being a MC. Otherwise he is a pop and hide kinda guy/gal.
Little influence in the game in my experience. If you really want pie plates, consider three units of 3 Biovores, the numbers will decimate enemy units, especially GEq and horde style armies.