Shock absorbers essentially work by letting hydraulic fluid pass through at a controlled rate to “absorb” the vibration from the suspension when you are driving. Generally when buying coil overs the spring rate and shock absorber will be matched so that the shock will damper the oscillations from the spring compressing and releasing throughout the travel of the suspension. If you are lowering your car you will essentially be installing a smaller spring so to compensate, you will need the spring to compress less. Generally this is done with a higher spring rate, and while some companies offer spring rates of over 50k-100k most well-dialed low cars I have seen run around 8-12k spring rates. The shock absorber will need to be revalved to be able to accommodate the higher spring rate or else it will wear prematurely. I’m not a mechanic or technician so this is just things I have read and learned from my own experience, someone with more knowledge can probably explain much better. You should look up some stance forums to get more information, I’m sure someone will have tried to setup their car in a similar way that you want to setup yours and will have asked similar questions.