Reseved node slots

I would like to reserve some node peer slots for my local nodes.
Using --in-peers and --out-peers I can adjust total amount of peer connections. However if some external peers connects to mine main node it will go out of open slots.

I can’t set it to some large number cuz my internet connection may not handle it so for now it is 50 / 50 peers.
So - can I reserve slots?
With my secondary nodes I connect to main node with --reserved-nodes