Every shock needs to be rebuilt/serviced at some point, just that:
- The general car scene neglects shocks maintenance.
- For lower cost systems, will be cheaper just to sell and replace
- Our butt dyno more often aren't sensitive enough to know it
- The down time and effort/cost being too prohibitive.
I raised that point of shock maintenance to bring awareness. The high initial costs of the shocks in question would justify the owner taking more active measures to ensure the shocks operating at a very high level. However, please don't take it as "you must rebuild them exactly after every xxxx miles or they stop working all together".
Based on experience from the community as a whole (Z and G platforms), you don't need to reinforce the rear shock tower when switching to true type (AST and JRZ in this example).
You do have a 6xx+ whp car, by default you have to take stringent care of your car anyway. Don't let this extra bit deter you. Being not your daily, whatever system you choose, you will have quite a while before any shock needs to be serviced or rebuilt. Don't worry.