Wotofo has introduced a new rda in their Serpent line. It comes with a spare BF pin for squonkers and it is pretty low profile at 30 mm tall. With four coil wire holes for single or dual coil configurations, the coil holes are large enough to accommodate larger coils like aliens, claptons, and transformer coils. My one complaint would be that the RDA is only 22 mm in diameter, with more and more mods being wide enough to sit larger (like 25 mm or 28 mm) atomizers flush.
https://www.heavengifts.com/product/WOTOFO-Serpent-BF-RDA-Silver.html
https://www.heavengifts.com/product/WOTOFO-Serpent-BF-RDA-Silver.html