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how much extra space in a volume to store LUNs

We create 1 volume per server in our environment.
Netapp does not allow using all capacity in the volume,
so you always have to make the volume a bit larger than the LUN(s) stored in it.

My question is:
what is the minimum amount of free space in a volume that should be guaranteed when using the volume to store LUNs ?

EXAMPLE

volume - 101GB
  LUN1: 50GB
  LUN2: 50GB

We will not create snapshots of the volume.

volume settings:
-> NO SNAPSHOT SCHEDULES
-> NO SNAPSHOT RESERVE
-> SNAPSHOT AUTODELETE ENABLED, AUTOGROW DISABLED
-> NO fractional reserve
-> storage efficiency not enabled

The 2 LUNs are online and working,
but the volume is showing as 100% used.

The key question:
Is this safe (only 1GB extra in the volume),
or would it be safer to make the volume for example 110 GB ?

We don't unnecessarily want to waste space,
but we also don't want to run into a LUN offline condition.
Seeing the 100% used on the volume kinda makes me feel uncomfortable.

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