We have a former "manny" neighbor (male nanny) come over every day (except weekends) if we're gone for 2 weeks. He knows how to tell if the filters need help or if something else might be wrong. I give a representative idea of how much to feed each tank. He can figure it out.
Where we used to live, we had a neighbor or the pro pet sitter neighbor come over. She didn't know anything about fish or birds, but she was unflappable when a fish jumped out. She just picked it up & put back in the tank; no problems!
I don't think the fish would be harmed with every other day feeding or even way less. My husband disagrees, so we pay to have it his way...
Those hard vacation blocks are not something I'll ever use again. I was given 2 different auto feeders but haven't ever tried them. I prefer a real person, even an inexperienced 1. They can always call us if they need to. I may give away the auto feeders or save them for an emergency.
I don't think I've seen gel feeders, but they're not something I'd look to buy either.