Here is some input from Leif:
"Sample rate has very little to do with latency, actually. The important part is the buffer size.
A sound device running at 192 kHz at buffer size 256 will have similar latency to a device 48 kHz at buffer size 64.
When I last tested the Behringer UMC202HD, latency was acceptable to me, at least for a USB device.
However, I recommend using separate devices for low latency monitor out (which BreakawayOne Full FM can do) and MPX out.
The Behringer (at 48k) should do great for main input and monitor output. For MPX out, I recommend the CM6631A USB dac, or Sanskrit 6th gen USB dac.
Best,
///Leif"