Two of those are prompters, and generally the presidents mic is not (or just barely) in the monitors. That wedge is for the question mics handed out to the audience/press core.
The mics are SM57's with A2WS windscreens. For a chuckle try and google up a price on the Shure A25M dual mount. You can buy it, but it ain't easy.
Having 2 mics is purely for backup reasons. And you do not have a choice in the matter of picking the mics, nor placing them.
And honestly a president is a good speaker. You really don't have to work that hard to get the level up. It's much harder, for instance, to get rock-loud vocals in a monitor than it is to run sound for a VIP.