i used the existing upper condenser bracket bolts to mount the horns. i wanted to do what KPT did with his installation but couldn't get corner brackets that would work with the holes he used. no matter because this worked out perfectly.
this installation took me about 4X as long as it should have. i used a bunch of terminals that i harvested from a box of various harnesses i had in a box that i finally sorted a while back to make my wife happy. that meant that every connector involved a soldered and shrink splice, which took a while! every connection is soldered with shrink, plus tape and loom where applicable to make it appear factory. the spade connectors have shrink over them for protection and i also used dielectric grease on all terminals. i found two holes in the side of the engine bay that worked perfectly with two metric fine thread stainless bolts i had, so i mounted the relay and fuse holder there. great because i refused to drill for a horn installation. keep in mind the Supertone kit comes with the horns, a relay and instruction sheet. no wiring or anything else.
the video doesn't pick up the bass of the low tone horn. trust me it's there. SO loud and obnoxious.