Ignition Coil firewall relocation query

Hi guys, I am wanting to relocate my coil off my intake and hoping to locate on the firewall... Is it perfectly fine to use/mount off one of the blower motor bolts as per my pic? I was also thinking I could possibly fab up a special mount and attach it to the unused heater hose fittings, as I will not be re-attaching the heater at all... If anyone has any good recommendations for tidying up/plugging those fittings I would appreciate that feedback too:)
thanks, jj