Specifically, SDR kits are usually rated as professional and test equipment, which are not certified by the FCC. The OP is about consumer products and other FCC-certified products.
I think they're not rated as anything. They simply have no manufacturer-supplied licensing/approvals whatsoever. So it is up to the user to gain an appropriate license and operate them to the conditions stipulated by that license.
Often by people manually modifying ones they bought themselves.
And, interestingly, many satellite receivers allow users to just enter a frequency in the supported range and they will happily load and display the data on that frequency.
FWIW I haven't seen anything in the new rules (admittedly I have focused on SDR and U-NII regs) which pretends to cover anything but intentional radiators (i.e. transmitters).
