Yeah, you could do that if you really wanted to.
The insurance company is going to require payment to bind coverage, and because of the low premium amount, most are going to want the full year's worth up front. Request a monthly payment plan to reduce your cash outlay, but some companies may not have a monthly payment option for this type of policy. Then you can simply cancel it when you get home. Even if you pay for the full year, you'll just get a refund check for the difference (which would be near the full amount if you only keep it for a week).
If that's the option you're really considering, then I don't know that I would recommend taking out a new policy.
Your current homeowner's/renter's insurance provides X coverage for electronics. Call your agent or look at your policy declarations page to find out how much coverage you have. Look for a section in your policy called SECTION C, which lists personal property. Find the Electronics listing, which is likely $3,000 or $5,000.
Your best bet with insurance is always to contact your local agent if you have coverage questions. Especially in your case, since Canadian law may be entirely different.