Canada Spouse Open work permit

[skar25]

I am currently residing in USA. My company has applied for a Canada ICT WP (LMIA exempt) for me and TRV for my wife. As per the company’s policy, they have not applied for my wife’s open work permit though I had requested for it.
I have the following questions:

1. When can I apply for my wife’s open work permit? Can I apply it before we enter Canada, or should the primary visa holder be present in Canada to apply for spouse’s open work permit?
2. I read in many blogs that even if I do not apply before-hand I can still request for the spouse work permit at the border or port of entry. Is this correct? If yes, is this applicable for land borders as well since we are planning to go to Canada by car.