After returning to Ikea, we were able to exchange the cabinets that were mistakenly delivered in-place of the correct ones. Apparently, we found a few cabinets that didn’t belong and were missing some from the order. After showing the receipt to the Ikea service desk, we were issued an exchange which went really smoothly.
After returning from Ikea, we began to hang the wall rails for the cabinets. Here is a video and a photo.
The rails did require me to pick up some cool cabinet screws and locate all the studs, but after drawing on the wall, everything seemed to work out. Go figure.