I’m not sure why you would want to increase your malware/spam changes by having multiple gmail addresses, but, fyi, it is possible.
J. D. Biersdorfer details how to generate multiple gmail addresses from one gmail address in Make Several Gmail Addresses Out of One.
I like Biersdorfer’s suggestion of the use of multiple gmail addresses for tracking which “registration” shared your address with spammers. On the other hand, so long as it all goes to /dev/null, why would I care?
I assume all registrations are for the benefit those asking for the registration, they not meant to benefit me. So /dev/null it is, without further examination.