Regardless of whether or not there's enough flow for rolling, it's not exactly the best tactic for a river newbie to start on as 1) it's nowhere near as easy as the old hands make it look, and 2) you're more likely to put yourself right off river fishing altogether after lots of blanks and/or losing tackle in weed and opposite bank vegetation.
The best thing to do is, as you say, go static but also go mobile, that is give each swim 20-30 minutes before moving onto the next one. That way you get to know your river and you can start to get a picture of what best to do in each particular part of the river.
More generally, rolling is a devastating technique, BUT in my (admittedly limited compared with others) experience it's very very limited to certain rivers - it's not really suited, for example, to very deep rivers, those with huge rocks and stones on the bottom, small rivers with frequently changing courses and undulating banks, etc etc etc. It's ideal for those with fairly uniform bottoms and depths (to about 5 or 6ft) and flat banks - that way you can walk along with the bait as it goes. Rivers like the Hampshire Avon and Kennet (which is where rolling is still common-place) are ideal.
I don't know anything about the Anker to suggest whether any part of the river is suitable but, as I said, start simple and start static and get to know the place first.