dont spawn it for enemies at first place.i had a ping actor that alies should have seen so i get all actors and if they were same team(this logic lives in a bp with authoritative role ) then call a function to spawn that runs on Owning Client.
btw its totally ok if you dont spawn mine for enemies just when mine blown on server you play a sound and maybe spawn an emitter on all clients .if you think you need to spawn it for enemies then using logic above you can make a fuction on enemies client to hide actors but risk of hacking increases.