Safe percentage for Span, Tween and Glyceryl Stearate?

Hi all, what is the safe usage percentage for
Span 60 and 80?
Tween 60 and 80?
Glyceryl Stearate?

And if I combine for example span60 (at its maximum %) to Glyceryl (at its maximum %), will that still consider safe to use?

Thank you
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