Yes. They slip over edge and then tighten with some set screws from the bottom. Most have NMO connectors for the antenna. They have other styles for hatchbacks which work along the same idea.

I use this one: Tram Browning 1246 UHF Trunk Radio Mount NMO and UHF PL-259 connectors with 17Ft of RG-58 Coax Cable https://www.amazon.com/dp/B00MYHA048/ref=cm_sw_r_cp_apa_pbxuAb2NDRE05

Pair it with one of these or similar: BROWNING 26.5-30 MHz NMO CB Antenna https://www.amazon.com/dp/B013PXD0J6/ref=cm_sw_r_cp_apa_edxuAbT78J4QR