The brake reaction bars fit above the shock absorber upper mount plate. It cannot be fitted any other way since the shock bracket has to sit flush to the top cross arm fitting. More important is that the kingpin bolt has it's washer(s) directly underneath it and therefore above the BRB. Note the wing mount bracket fits to the shock absorber plate so has no direct bearing on this issue. The BRB may need trimming so it has clearance to the wing bracket though. See below.
![[Linked Image]](https://i.imgur.com/sxFN9ah.jpg)
On later models with camber adjustment as above, a self adjusting pair of convex/concave washers (as above) are used and they need to fit directly under the kingpin bolt in order to function. These washers need to be lubricated on assembly (thinner convex upper) and have been known to explode if fitted incorrectly!
For chassis mounting location it's fine to drill with the car jacked up or on a chassis supporting ramp.
BTW I would highly recommend replacing kingpin bolts with these inexpensive shouldered ones sold by Wolf Performance. Link below.
![[Linked Image]](https://www.wolfperformance.co.uk/wp-content/uploads/2022/05/wolf-performance-flange-oiler-bolts-1024x768.jpeg)
The OE ones have only the hex corners of bolt bearing on the washer below!