Well first I would start with Policing Redefined, which is an overhaul system for ped interaction and backup (Note that Stop The Ped doesn't work on Enhanced which is why I recommend Policing Redefined). Most callout packs should work, you can try other plugins too (if you crash then it probably doesn't work for Enhanced). If you wish to venture into custom EUP or custom vehicles, that is more difficult and requires you to convert Legacy(gen8) models into Enhanced(gen9). If you are looking at map mods (mostly paid) like LWE, FOSAU, GTAVR, which put trees & props around the map, it may crash while using LSPDFR. Any other questions then you may ask.