Pretty simple mod, anyone can do it as long as you have a screwdriver and/or a size 8 socket wrench, and can go to your local hardware shop to buy some long bolts
On R32's the PTU is mounted directly onto the rocker cover, and unfortunately is subject to a lot of heat from the engine. This can cause the PTU to overheat and as a result the contacts can warp and wires melt or get brittle from heating/cooling down repeatedly for many years of use. The PTU comes with a heatsink, but unfortunately getting airflow over the PTU can be an exercise in futility, esp if you have a intake pipe running across your engine and strut reinforcement bars etc.
The solution is to space the PTU away from the engine or mount it onto the firewall. The latter can be a bit tircky with wires having to be extended and new holes having to be drilled onto the firewall. By spacing the PTU higher up, you can actually move it into the path of airflow under the bonnet, also by getting some space between the engine and the PTU you can improve heat dissipation from the ehatsink (which is unfortunately on the bottom of the PTU).
The pic should be self explanatory as to what you need to do:
I just used these ones I had lying around in the garage, but ideally I'd wanna make a sleeve to go over the exposed thread, just in case the nut under the PTU holding it up comes loose.