If your requirements are what they are, then you need to look into the X120 or the Orion V4.
X120s do not look OEM when off like the Orion V4, but they are ok.
They are pure white, Orion V4 are pure white.
X120s are brighter than E92 2012 MY, Orion V4 are brighter still.
Both are LED powered.
Orion V4 are smoother but the X120 is also smooth.
1) yes, same install
2) yes, you don't need a harness, all is included.
3) yes, included.