At 2NL, usually fist pump when they go all in while you're holding TPTK, 2 pair, overpair, or a set. Adjust your range depending on whos in the hand with you. At stars microstakes table, you can usually use the "Find a player" option to find multitablers. Most multitablers at these stakes don't hide their name from search and you can pretty much determine their style. You don't really need a HUD to beat these microstakes games.