If you have room either on top or under your bumper, I would mount them there. I would not use clamp type mounts, unles they got beter than the ones I tried they won't stay in place. I would drill holes in the bumper to mountthe lights. Also I would use a relay kit to supply 12v from the battery. By using a relay you can use smaller wiring for the switch and have the larger gauge wire suppling the driving lights.
I had a van that I wired up driving lights on and had a on-off-on switch wired in to supply two sources of power. One side was wired to the high beams, so when they could be turned on with the high beams. The other was a switched source, so I could run them with the low beams or on without the headlights being on.
I think the laws in most state that the driving lights can not be on with high beams. I say this because of the way my truck is setup from factory. If this is true then I would tap the low beam voltage instead of the high beam.
It really worked well, was simple to install once you found you power sources.
If interested I could draw up a diagram of how I had it wired. I would have to look at a relay to remember the labeling of the relay. Send me a PM and I get one worked up.