The phrase "dwell at" is correct and can be used in written English.
It means to live or reside at a certain place. Example: The old couple has chosen to dwell at the beach house for their retirement.
You dwell at some length on Saunders's human, as well as literary, qualities.
All of them, curiously, dwell at least partly on the complexities of parenthood.
Here is not the place to dwell, at length, on the debates surrounding that folly and its denouement.
If ever there were a place on earth that allows one to enter and dwell at peace, this would be it.
That the living ever dwell at the frontier of time seems to encourage a fallacious sense that the hour is getting late.
Tadpole shrimp typically dwell at the bottom of bodies of water, feeding on organic debris or preying on small aquatic animals and larvae.
The book dwells at length on nastiness among the powerful.
He dwells at length on why the reversal on tuition fees did so much damage.
The book dwells at length on women's lives, "like being under an anesthetic," she writes.
It was the first time he had dwelt at such length and with such passion on human rights.
Mr. Roosevelt has dwelt at length on the plight of the underprivileged third - ill-housed, ill-clad, ill-nourished.
