Never used um, but I did notice once on QBP that they had foot specific ones now. Since it sounds like you're just riding in sneakers or something for now, not all of this advice will work for you. Nonetheless, here's my toes is froze guide:
Tape your shoe vents closed! Electrical tape is probably best, it seems to leave the least gunk. Or, if you have an old pair of shoes you upgraded that still have miles, make them your winter shoes. Even if you're using covers this still eliminates routes for cold air to sneak in.
Once that's not enough, I add DeFeet Woolie Boolie socks. They're my absolute favorite wool socks. So thick and wonderful I tend to wear them around the house. At this point I might add toe covers, but I don't feel like they do much especially if I taped the vents.
After that I go taped vents, wool socks, maybe toes covers and then shoe covers. I had some PI ones that sadly they don't seem to make anymore. Then, if it's really nasty but for some reason I decided riding > snowshoeing, I put on my socks, slip my feet into a newspaper bag or similar, then into my shoes and on come the shoe covers. This combo doesn't breathe for beans so it gets a little humid in there, but it's waaaaarm.
Oh, you can do similar for your paws too. Goes fleecy liner glove, latex/nytrile glove, big windproof gloves like a Wombat or some such.
All these combos were tested last winter while I was unemployed, bored and faced with weeks of single digit days.
"True, but if you throw your panties into the middle of the peloton, someone's likely to get hurt."