SutekhRoyal GingerCrusader Royal
Bracknell don’t have a ground, they play in Sandhurst and a three way ground share would be logistically impossible. I’m also fairly sure the ground is not up to NLS standards.
I’d have thought Aldersh*t or Farnborough would be viable ground share options.
Not exactly in the locale though are they? Woking would be another of that type that'd fit the bill.
And Bottom Meadow would probably be fine for a club starting out, esp. as I think Reading Phoenix starting at the National League levels, while not impossible, is rather unlikely.
Anyway, I'd suggest Arbor Park is the obvious choice (don't think Slough are sharing with any other Saturday non league outfit currently). After that for grounds in the locale it's Maidenhead United then Bracknell/Sandhurst and Binfield. Wouldn't rule out Marlow as a possible either.
Still don’t get how you shoehorn a third club into Bottom Meadow….
Marlow is a quaint ground but logistically it would be a nightmare. It’s got no car parking space and a crowd of more than a few hundred would severely strain its capabilities. Wycombe would be much preferable and the clubs have a history of ground sharing.