I have Firehouse ARC 2 strobes (4 LED) on my Mavic Air, attached with 3M Dual-Lock low profile tape. Currently, I have white and red. My objective is to make it easy to spot in the sky, and not to follow any color guidelines, as you would have on a manned aircraft - red on left front, green on right front, etc. I mount red and white strobes side by side, onto the bottom of the battery (facing down). This scheme gives lower hemisphere coverage, essentially unobstructed. If you want upper hemisphere coverage, put one on top, also. I consider lower coverage more important, because it makes it easier to see from the ground. The fact is that it's more productive for you to stay away from obstacles of any kind, than it is for them to stay away from you.
Wherever you mount them, having multiple strobes flashing out of sync decreases the time between flashes. Also, these lights have three modes: ON, FLASH, STROBE. Consider setting one or more lights to FLASH, which will produce a longer burst of light than STROBE, though it will drain the battery faster (though as a practical matter, you should still be able to get several flights in before a recharge is needed).
There are some mounts that snap on to the arms and into which you put your strobe. They have their good points, but there are some issues to be aware of. Although they provide minimal blockage, the fact is that nothing provides as much coverage as a bare strobe attached to a flat surface. Also, attaching these mounts may make it impossible to attach anything to the arms, such as prop guards, landing skid extensions, etc.