1) Right-click on the monster. Properties - General - Quantity - The quantity does not increase. Check the box. OK!
2) In general, you can (for each object, you can change its properties or, conversely, make it so that it doesn't do anything and just stands there "for beauty"). But why bother if there are already enough mines and teleporters?
There is already a relevant topic. Next time, please post there:
All questions about Mapmaking
/topic/5758/
(Василь Симоненко. Люди – прекрасні)