Well, the FT-857D comes in at -21dB according to ARRL lab tests.

A FT-1000MP is only 6dB better at -27dB.

An IC-746 is -23dB, as is an IC-756 (non pro, pro is -31dB)

An IC-703 is -24dB

The absolute best I can find in the ARRL comparison charts is the
TS-950SD which comes in at -42dB

So we don't need to worry about SWR meters that can, at most, cause -40
or -50dB IMD products.

Dan