You’ll have to look through all players, get their pawn location and subtract your desired location. The length of the vector is the distance from the character to your desired location. To get a point outside of all the players you’ll need to repeat this process until the vector length is greater than all your minimum distance for all players.
And easier method would probably be to pick a spot on the map to place a marker and use its position to spawn your mesh. But of your using dynamic spawn points the you’ll have to use the above method of procedurally selecting a point.