I have to wire 1 x heat ,6 x smokes plus 2 X outside sounders Do I need 2 x relay bases and where to install them in the circuit. Does it make a difference?

Aico EI128R Relay Mounting Base For 2100, 140, 160 & 260 Alarms
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Part No.: AICEI128R
Aico's EI128R Relay Base for use with 2100, 160RC and 140RC Series Smoke and Heat Alarms and 260 Series Carbon Monoxide Alarms. Can be configured to give a 5 amp 230VAC or Volt-Free (Clean) output. Continuous or Pulse operation 5 Year Guarantee
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