Problem with amplifier delay

Hi everyone, it looks like I’ve made a mistake. I have a McIntosh MX 123 AV preprocessor which has 3 zones available for audio output. I use zone 1 for my living room, zone 2 for my lounge, and split the zone 3 output to 2 different pairs of outdoor speakers. Zones 1 & 2 are powered by McIntosh amps, but in order to have Wi-Fi and app based control over the outdoor speakers, I was advised to purchase 2 Sonos power amps. The intention was to have the ability to have a continuous, multi zone signal (music) as you walked throughout the house and back yard. Unfortunately, even though I’m running a direct analog signal through RCA to the Sonos amps, they have a really long processing delay. There appears to be no way around this issue that I’ve been able to find, so it seems I’ll have to find a different equipment option. What would you recommend for power amps that will pass through the analog signal without delay, and allow me app based control over the 2 different sets of zone 3 speakers independently for on/off and volume control?

thanks in advance!