The clamp that you linked to has a wall mount bracket on one side. Cannot see how that will work with a mast and antenna.

Maybe you are looking for something like one of these two clamps:

https://www.amazon.com/Easy-Up-Heavy-Duty-Mounts/dp/B01N0RSBBR

https://www.amazon.com/Double-Antenna-Anti-Rust-Finished-Pipe-Mounting/dp/B08VHHDLP5

Google for:

Double Clamp Pipe to Pipe Standoff
Double Antenna Mast Clamp

This offset arm might help: https://www.dxengineering.com/parts/dmn-kb144

A right angle bracket to go between the offset arm and to clamp to the receive antenna. You drill through the offset arm to use a single clamp reaching around the antenna mount and through the offset arm.

Please share what solution you found to work for you.

Happy DX.