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Hi, can I put my work address for landing? as its the only address I know I will be at.
I think there should be no problem with that. Remember that you will be receiving your PR card at that address, so make sure you can receive mail at work.

Also, remember that it will take at least two months for you to receive the PR card (sometimes a few more months), so you should be sure to be at the same job. I'm anyway pretty sure that you can be able to change the address where you will receive your PR card later on by just calling IRCC, so even if you change job it shouldn't be an issue.