Amp power install question

[Veeger 10+ year member]

I'm installing Alpine SPX-17PROs for my front stage and a JL Audio Stealthbox in my 2007 F-150. I am powering the SPXs with an Alpine PDX-4.150 and the Stealhbox with a Pioneer GM-D7400M.

I am planning on running a single 4ga power cable to a 4/8ga dist box and 8ga out to the amps.

Here is the question:

Will it be ok to run a single 4ga ground to a 4/8ga dist box and do a 8ga out to each amp or should the amps be grounded seperately?

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