Tips for "zoning out"

In the new year, I'm going to be working on setting up a home spa. It will include a hair salon-style hooded dryer and modest skincare products (a resolution is to do more of it, including weekly exfoliation and moisturizing a few times a week). However, I've also decided that at least twice a week after I return from work, I am going to "zone out." I plan to use an eye mask to block out visual stimuli and listen to white noise with my headphones. Set an alarm on my fitbit for 30 minutes.

The purpose of this is mindfulness, to help me re-evaluate my thoughts. For almost the past five years I watched The Young Turks on a nightly basis, but I'm not going to do that with the same regularity given Trump returning to the white house. Likewise, since the election I've uninstalled all social media besides YouTube from my phone and only do Reddit on my computer. Replacing it with something much better for my mental health, that doesn't involve looking at a screen or expecting instant gratification.

I don't want to do formal styles of meditation. But if you have tips for this idea, I'd appreciate it. Should I lay on the floor (it's carpeted) or in bed? Supine or prone? Or should i sit in my easy chair? Is it important to keep a journal of thoughts?