Not a foot fitter but
My local advice? Get some cardboard, say a pizza container, and a pencil. After a nights sleep to let your feet relax and before you put on shoes draw the outline of both your feet. My left foot is fractionally wider than my right, check yours. Take the widest outline to the shops. Pull out the shoes insole and lay that over your foot outline. There is no argument about feeling with the outline. You do still need to try on the shoes as the outline only checks 2 dimensions, you need a volume check too.
I have standard size 8 UK feet as confirmed by a custom boot maker in the UK! If you do visit the UK and have a month or more there then you can get custom boots from them. First visit to get your size and they start building them. Once built (~2 or more weeks depending on the queue) you then go in for a fitting, if more adjustment is required you go back for a 2nd fitting 1 or 2 days later. very rare to get a 3rd fitting. This is for leather shoes/boots. They do non leather shoes/boots too and those don't require fitting ... but you need to know your accurate size.
https://www.altberg.co.uk/boots In this country I have to ask for size 43 wide...
I have found Salomon XA Pro 3D size 43 to be ok, they do a 'wide' version of them but they are no wider possibly more volume but no width increase.
Not certain what your feet require in a shoe? Some shoes are very flexible and you feel the earth/rocks under your feet, others can be very rigid ... I prefer something between the two possibly more towards feeling the ground.
Hope that helps