I'd disconnect the battery and put the vehicle on jack stands under the axles so that there's no weight on the tyres. Given you're heading into the wet season with high humidity, I'd consider plugging the exhaust pipe and taping over the air intake to reduce the likelihood of moist air settling inside the engine.... may not be necessary but that's what I'd do
(The alarm system over a few months will flatten the battery, which can cause other issues...like rendering the battery U/S... that's why I'd disconnect it). If you have a mate who would trickle charge the battery for a couple of days a month, then remove the battery and ask them to do this for you. Alternatively, make sure it's fully charged up before you leave. If it's in good nick it will lose about 5% of its charge a month in storage.
				
			 
			
		 
			
				
			
			
				MY99 RR P38 HSE 4.6 (Thor) gone  (to Tasmania)
2020 Subaru Impreza S ('SWMBO's  Express'  )
2023 Ineos Grenadier Trialmaster (diesel)
			
			
		 
	
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