When searching for 1100 watt heating tape, a number of returns match almost exactly the image you've provided. A few of the manufacturers provide NEMA separable molded plugs and also offer bare leads. The bare leads would be useful in this case, as you can add your own 90° banana plugs.
To locate the correct plug, I used "right angle enclosed banana plug" as the search term. The image and source information came from Zoro online. I had better returns using shrouded in place of enclosed. Many sources. Be sure to check the current draw for the tape you'll use and the connector you'll select.