I prefer the way they look without the grills on. I keep them off my P3ESR but have left them on my Super HL5 Plus for the most part, mainly because they are in a high traffic area. I know they don't offer a lot of protection against an accidental scratch or other incidental damage, but...
If you need something to take the grills off, try these:
https://www.ebay.com/p/2254577669?iid=221860340237
If you need something to take the grills off, try these:
https://www.ebay.com/p/2254577669?iid=221860340237