I did a quick test in my UR816C with a LesPaul with PAF57 pickups, played on the bridge one and made very hard attacks on the strings.
I could raise the input 1 Gainknob to about 10 oclock before clipping. That should work for recordings.
Otherwise you can always use the PAD on input 1.
Remember what was said already, it’s gain not a volume.
When your signal on the inputmeter is below 0 with that knob down, it works just fine for you.