Yeah, when I played them I didn't actually built their UI much in the very early game (and probably built maybe 2 of their UU total). I certainly grabbed pottery earlier than I usually do for the trader. For ancient era, I'd just make sure to build at least one UU and place one UI as that'll basically get you a classical golden age. Otherwise I wouldn't prioritize the UI above luxes/pastures etc. at the start (unless you have a city without fresh water - use it to pump the housing up quickly). It would be the next round. When expanding, see if you can place an early city spot with good number of pasture/camps, and get those up, as a prime trade route spot. The extra trade route tiles are definitely more a 'bonus' than a specific strategy. It's like faster expansion more than a guarantee you'd be able to grab something.