unpack it and and place it on toilet with the standard seat raised
Yes. More than one person uses the bathroom and it is simple and light. Easy to remove and replace as needed.
The height is 5.0 inches.
The dimensions of the product are as follows: 14-1/2 in. x 15 in. x 5 in. Your remaining question cannot be answered at this time.
No, this product will not fit an oval toilet.
Yes it will
Yes, it is very easy and stay in place.