DHCP snooping and DAI on small Fortigate

My 60F runs at between about 65- 80% memory for basic functions in a SOHO as it only has 2G of ram. I want to set up DHCP snooping and DAI as I've been targeted by DOS attacks and ARP poisoning. Will this send my little gate into conserve mode? Does anyone have an idea of how much of the resources this would use? There are less than 25 active clients. Supporting one Fortiswitch and one AP.