Thank you for your suggestion. Here are the explanations we give:
1. Regarding the manual, we are in the process of updating the instruction manual inside the package, and what you have received may not be the latest version of the manual. You can download the latest instructions from the Installation Guide on the product page or visit ''mcocodsupport.com'' for more information.
2. Regarding the package upright, we can't confirm that every customer will stand it well, and if not it could cause the package slip and fall over and be a safety risk.
3. Wide Door Seal is designed for shower that don't need to cut guide rail, enhances the waterproof performance, which is standard. If your shower does not need it, you can contact us for narrow door seal.
4. As shown on page 11 of the instruction manual within the Online Installation Guide, the installation criteria is as follows: After placing the guide block in the center in the correct position, make sure that the glass is vertical, draw the hole-punching point, move the guide block and the glass out of the way, punch the holes, and then install the guide block. We have show you the diagrams at manual, if you have any doubts you can watch the steps in the installation video.
5. Your suggestion about gluing is great and we will take consideration. It's best to remove the glass corner protector after the installation is complete, it will not interfere with the installation. Thank you for your valuable comments, we will try to do better. Thank you very much!