Bass traps are really designed to fit in corners, because that's where they are most effective. I would not have them standing around in the room.
You can experiment with free standing or wall mounting, but for general purpose use, mounting them on the walls, with airspace behind them, to take care of early reflections is a good option if you need them to also control the room when mixing on monitors. So, maybe something like one of them (assuming 2'x4') in front (horizontal) of you, a cloud overhead, and then on each side at the first/early reflection point off your monitors. Then, that's also going to determine where you would sit to record. That's more or less what I do, but I've got a small space and there's really very limited room to have more than a chair or two and a few mic stands.