Raise my subwoofers off the ground approximately 12”?

"I’m looking for some sort of subwoofer stand to raise my subwoofers off the ground about 12”.."

You might want to check with the sub manufacturer to determine if there is any down side. Raising the sub off the floor, for example, might result in reduced output since there will be less boundary (floor) reinforcement. Might make for a good no-cost experiment!

Enjoyed my ASC Sub Stand for years.

I have a pair of JL Audio F113V2 subs and in my former home (in a room with terrible bass) I built some stands using 4 x 4's and sturdy metal hardware, and that reduced the boominess in that room.

I'm about to move into a new home and if I don't need them, will probably try to see if someone else can use them.

What is the reason for doing this?  Does it have to be 12" or are you just trying to get them off the floor to keep from passing vibration to another room or something below your room?  If you just need to get them off the floor, consider the Auralex Subdude - https://auralex.com/subdude/

Turnbowm has it right. You do not want to take your sub off the floor. You will just make them less efficient forcing you to raise the volume distorting the amplifier and the driver. Subs also should be up against a wall or in corners again for efficiency reasons and acoustic reasons. You decrease room interaction this way. Subwoofer manufacturers put their subs on the floor for a reason!