What is a good npc? sentry's take up a lot of memory

Help
1

Sentrys work well as npc’s but they take up a ton of memory to be placed around the entire map and have them not move or shoot. what is a replacement?

2

Props.
They only cost 10 Memory Units per prop. (any prop)
Also, you can place an (Invisible) Barrier over them or make them on your team to stop them from moving.

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3

You could use barriers.

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4

The armor stand prop w/ armor. Also have a barrier over it like @Haiasi said.

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