No. Any analog line in, such as the RCA input on your Amp, will have the 75ms delay on any data. You’d be much better off ‘bonding’ the Amp with the PLAYBAR instead, which sets them up as one ‘Sonos room’. In that manner, your ceiling speakers become surrounds for the three front channels of the PLAYBAR.
I’m not a fan of four surround speakers, but some use it, apparently. I’d think it muddles the surround stage, but I’ve never tried it, either. On the other hand, it seems like you’re going to use two, and the other two will only be turned up for music. Which is important, when playing music on the PLAYBAR, and the Amp bonded, the music would be in sync, the delay has been already paid, and the input isn’t via the analog line in. Or, if they’re two separate Sonos ‘rooms’, they’ll play music in sync. The 75ms delay is only reflected in the analog line in.
If your intent is to have the four ceiling speakers play the same content as the ‘front channels’ of the PLAYBAR, rather than surround data, other than the 75ms delay, this would work.