Yes 300mV RMS is usable. Up to 500mV maybe, so to get 0.5mV at the -60dB MC output. The iRiaa passive networks saturate in the HF if with much input signal. They are also usually tuned for 50Ω Zout generator source. You will notice saturation when same frequency higher level square waves corners become well rounded.
Producing higher enough AC vs their nominal spec. At least when unloaded. If after loaded it won't result to below 50V DC you will have to up the value of the RD resistors. 10Ω value at least. So to create some RC voltage drop and counter the trend. 45V-49V DC loaded is safe. Consider 50V DC loaded as max at your local mains max.
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