Can I connect eight LED strip lights to the same power source?
The answer really depends on the product have or want to use.
Most good LED RGB-W systems are low votage and subject to specific wiring codes.( Check those of your state and local codes.

5Amps per channel is typical and may require more sophisticated wiring techniques.

Additionally, W in RGB-W is not gerenally bright enough for proper illumination. I assume you have determined this given your product descriptions.
You may find that the wiring is best concealed in a cove.