The Yongnuo RC-603's seem to work with the A7riii. There doesn't seem to be a specific Sony set. I used the Nikon version and add a compatible Sony connector cable from eBay.
They give a good distance and don't need a line of sight either. You can set the frequency so can trigger several different camera with different remotes or multi cameras with one remote.
Under network tab in menus there is a "ctrl w/ smartphone option". Haven't tried it in years myself but it used to even let you control the exposure change SS, Aperture, ISO etc and give you a live view. And it's free
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