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noise floor with LNA turned off at 1MHz RBW and 2.5GHz

My main question is dynamic range. We are going to use this equipment to measure FCC part 15 for 2.5GHz product, DUT output level is about +8dBm.

FCC requires 1MHz RBW, What is the noise floor with LNA turned off at 1MHz RBW and 2.5GHz?

With +8dBm CW tone, what is the minimum attenuator setting to avoid saturation and give us the best dynamic range.

Please check the forum first. This is discussed quite often now and otherwise creates multiple entries:

https://v6-forum.aaronia.de/forum/topic/danl-values-with-and-without-optional-preamplifier/

https://v6-forum.aaronia.de/forum/topic/spectran-v6-sfdr-specs/