Place the speakers a few feet behind you and about 3 to 5 feet to each side of where you are sitting. And, whenever possible, using a conventional sound system, even in smaller venues, place the speakers on stands. It makes a huge difference, both from a monitoring standpoint and in what the audience hears. If I recall, you are using a Samson Q7 mic, so feedback should not be a problem.
------------------ Travlin' Easy
PSR-S950, Bose L1 Compact, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, Morgan 33 Out Island Sailboat, and lots of other silly stuff!