Can I purchase AppleCare+ for this Mac?

If you have AppleCare+ it will cover a large portion of accidental damage.

https://www.apple.com/support/products/mac.html after the jump see "How to buy"

AppleCare+ (similar for iPhone and iPad, each incident of accidental damage) for Mac will carry its own price tag. Screen damage or “external enclosure damage” will run $99 per incident, while other damage, including water damage, will run $299. Users receive coverage of two incidents under AppleCare+, and after the two incidents have been used up, out-of-warranty replacement rates will apply

(*note: there may be some delay due to the temporary Apple Store closures)

call AppleCare Support at 1-800-APLCARE (800-275-2273)

or

Call Customer Support (800) MY–APPLE (800–692–7753)

I suggest starting here: Buy an AppleCare plan - Apple Support