Do you want to attach the coax to the actual shingle area of the roof? I've not seen that yet and have only attached coax and hardline to vertical walls on the way to the roof.
If you just need to keep it from flopping around on the roof, you can use some PVC conduit straps and some nails/screws into -just- the shingle (not through the sheathing under them). They'll be grey in color, so if you want them to hide, you may need to periodically hit them with some spray paint of a suitable color.
Do you want to attach the coax to the actual shingle area of the roof? I've not seen that yet and have only attached coax and hardline to vertical walls on the way to the roof.
I think I'd secure the cables at the base of the antenna(s) and at the roof edges. That coax is large enough that unless you get really high speed winds I think they'd stay put. If wind gets high enough to 'mess' with that coax... I think I'd worry more about the roof.