Efficient way to make mobs spawn around player

[Fluffy i Am]

Hello!

I'm currently making a skript that involves spawn of zombies, does anyone know how i can make them spawn around the player without making the server working overtime for it to work?

Thanks

 

[Goose]

this is a skript i made that makes 2-3 zombies spawn in a radius of 5 blocks around the player every 30 seconds

every 30 seconds:
    loop all players:
        loop (random integer between 2 and 3) times:
            loop blocks in radius 5 around loop-player:
                if loop-block is not loop-player's location:
                    spawn zombie at loop-block

 

[Fluffy i Am]

this is a skript i made that makes 2-3 zombies spawn in a radius of 5 blocks around the player every 30 seconds

every 30 seconds:
    loop all players:
        loop (random integer between 2 and 3) times:
            loop blocks in radius 5 around loop-player:
                if loop-block is not loop-player's location:
                    spawn zombie at loop-block

Is there anyway to make sure they don’t spawn inside blocks and suffocate?