Spurs is a genuine worry. They have a decent enough team to keep picking up points.
Not worried about United (or Arsenal LOL). United are strong in games against the big six. They are set up to defend and counter. They beat Chelsea, City, Spurs, Leicester (which was an odd game IIRC) and drew with Arsenal, Liverpool. But they will struggle when they have to create chances while having plenty of possession.
We should be able to hold off the chasers though. Not because we are any good. But because they are all having their own set of problems and over the course of the season, it will show. One purple patch will mean nothing