Here are some recommendations for good laptop cooling pads for the Razer Blade 18:

1. Thermaltake Massive 23 LX - This pad features a large 230mm fan to maximize airflow and cooling. It's designed to fit up to 19-inch laptops and has an adjustable height. The aesthetics match well with Razer laptops too.

2. Tree New Bee Cooling Pad - With its 4 fans and 2500 RPM, this pad can keep your Razer Blade running much cooler. It also has RGB lighting effects if you want to accessorize. Fits 17-19 inch models.

3. Havit HV-F2056 - A slim and portable option that still offers great cooling capabilities. It has 3 quiet fans and an ergonomic stand for better viewing angles. Won't take up much desk space.

4. TopMate TM-5 - For a heavier-duty cooling pad, the TM-5 has 5 fans and multiple height options. Has a large mesh platform that will fit the Razer Blade 18 nicely. Quiet fans despite the high airflow.

Any of those four picks should help lower temperatures and improve performance by keeping that powerful Razer Blade 18 cooler under pressure. Just make sure to match your laptop's size and pick a pad with adequate airflow for a desktop replacement machine.

Thermaltake Massive 20 RGB Steel Mesh Panel Single 200mm Fan 10"‐19" Laptop Notebook Cooling Pad: https://www.amazon.com/Thermaltake-Massive-Notebook-Cooling-CL-N014-PL20SW/dp/B077974X66?tag=6890-20

Havit HV-F2056 is one of the best selling cooling pad for most laptops.

I'd recommend the Cooler Master NotePal X-Slim. It's got a large 160mm fan that moves a lot of air, and the ergonomic design works well with larger laptops like the Razer Blade 18. The blue LED lighting looks great with the Blade's aesthetics too. Just make sure to check the dimensions to ensure it'll fit your setup.