I am still in the old school. I use all my dried eggshells crunched up. Not so easy if you have a large plot, but ask friends and neighbours to save them for you. Mrs Bouquet
I have always done that with my broad beans, so fragile as a plant for the first few weeks.
I put them in a tin and leave the tin outside in a cold store, so they become fragile and easier to crush that little bit smaller.
Its really one of the few things that are out then, so they tend to head towards them.
As for copper, I have always used copper tape just under the rim on my pots that have sweet pea, French beans, carrots and other things. It has always pretty much deterred the slugs and snails climbing into the pots. Do though pick them up regularly to check none hiding underneath that can go through the bottom of the pot.
Away from pets and not in the open, I still use pellets, like around the inside edge of the greenhouse and in covered raised beds. Do also use my homemade nematodes for all my potatoes.
The best thing though is to go out with a torch late evening or early morning and pick them off, especially after a rain spell. That will keep your nematode supply ongoing, so they get a kind of second life