EpisparhKurakilIt seems we each have a different take on which mods are most important, perhaps based on how we play.
My recommendation was for First set to make - a set that will make your life easier for unlocking engineers and grinding materials.
I have plenty of other setups that I use but effectively "Maverick - Collector" is my go to for any kind of ground ops. Even if I get tipped off before arrival in high security military settlement I still can clean it without alarms being triggered or enemy shot a single round.
I'm just listing what I do and why. I know others value certain things more and have a build for such. An initial engineer grind build is perfectly valid.