Welcome to Coda! Glad to see that you are enjoying Coda.
I am going to give you a consulting answer… - It depends.
Do you frequently re-use sets? How big are the number of rentable objects and other data?
What is the relationships between Rentable objects? :
Row 1 Object
Row 2 Object
Row 3 Lot
Row 4 Of
Row 5 Other
Row 6 Data
OR
Row 1 Object, a lot of other data, each in a column
Row 2 Object, a lot of other data, each in a column
Depending on the answers to the above, your design could change tremendously.
In general though, there is now one correct way, the best way, especially so early in learning Coda, is to experiment to see what works best for you.