I'm looking to route some appliance cables (microwave, lights, radio etc
- I'll keep it to 13A max though - the feed is to an extension block)
through the kitchen worktop to tidy things up and free up sockets above
the counter. The grommet would be out of sight - behind the microwave
for example.

I bought one of these 80mm, just to see:

https://www.ebay.co.uk/itm//321759119678

It's fine, but a bit flimsy - the cover could pop off quite easily. And
possibly 60mm would do it.

Anyone experience of similar?

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Cheers, Rob