Use a 4 wire with 2 ground 1 insulated ,isolated ground ,with a separate buzz bar in the breaker box ,and I use awg10:less resistance and my old electrician audio friend put in 30 amp silver breakers from Siemens in Germany which were very hard to get and over $100 with shipping much better then the thin $7 copper ones that oxydize and need to be replaced every 5 years ,that’s a good rule of thumb .
my brother tried getting the industrial Silver breakers and this year could no longer get ,par for the course with supply chain , but well worth the effort , these things alone a Much purer blacker background .