Toe overlap sucks when doing hairpins and the like, which should ideally be rare on a TT bike, but I prefer to have less toe overlap on a road bike.
Anyway, look at front-center (and wheelbase - chainstays, absent that); some manufacturers tend to have more toe overlap and some less. My wife has a Canyon Speedmax TT / Tri bike and it doesn't really have toe overlap.
Some people are are bothered but most aren't; if you are, look at bikes which have slightly more room in front. Off memory, Specialized tends to have smaller front-center than Canyon at the same size, Look at bike geometry sites, basically.