They were on stakeout watching you.
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Nice to have separate so if you pop the breaker on the outlet you are not in the dark.
Self tappers with rubber washer used for exterior panels. And/or silicon over each one.
Unistrut. Not cheap. Probably not worth it to mount one conduit. And you need bigger fasteners and holes to mount the strut than for directly mounting the conduit.
If you spill too much syrup, you may need another pancake or two to soak it up.