The only way to mount is a clamp on style light mount, drill some holes and bolt the lights or do what I did and weld on some tabs.
A led light bar is the brightest flood type beam you will get, also the most expensive and unless you drive backwards, it really isn't necessary.
The Hella fog lights will most likely be a more yellow-ish light beam (I prefer yellow-ish over the 6000k blue-ish that most led lights are) but the Hellas will require more amps being a halogen bulb (which might be just me, but I prefer lights that require less amps anytime I run any type of lights) but you can also just replace the bulb if it goes out instead of replacing little leds or the whole light.
And the led "pod" style lights will be the smallest amp draw, cheapest lights to buy and can take light "filter lenses" to change the color and they will still produce a good flood beam. Unless you want some IMO over priced led lights that all do the same thing for the average user, just to have a "name brand" these are the best auxiliary lights to have in the back.
Hope this helps some.