Should I rotate or flip this mattress?

Yes, and that is a real advantage here. Unlike one-sided beds, this is a true two-sided flippable mattress, so you can both rotate it head-to-foot and flip it over. Doing so every few months spreads wear evenly across both sleep surfaces and helps the bed hold its feel far longer, which is the main reason its usable life stretches despite the value-tier comfort foam. Spot clean only and use a protector.