Jennifer Maas TV Business Writer Fox’s Susan Sarandon and Trace Adkins-led country music drama “Monarch” didn’t the highest of Nielsen notes Sunday night, but it did manage to keep enough of its NFL lead-in audience to land the network’s most-watched fall scripted premiere in three years. Immediately following an NFL doubleheader, “Monarch” debuted at 7:45 p.m. ET/4:45 p.m. PT to a 0.8 rating among adults in the 18-49 age demographic and 3.8 million total viewers, according to initial Nielsen data. Due to the nature of live sports, these results will likely adjust (likely down) when finalized numbers come in later Monday.