Sub questions

front firing has always sounded better to my ears and room.  martin logan?  i owned some for a while.  sounded best projecting into the room.  

Try it all ways that’s the fun and it’s easy if it’s not huge.

I have down firing subs(HSU) in my listening room. The room has HW floors. I do have small pieces of carpet under each sub. I found it better for my room,and ears. @johnnycamp5 summed it up. Enjoy the new sub. What ever you end up doing, I think you’ll be much happier with two subs. 

I have a Martin Logan Dynamo 700 subwoofer that I have setup in the forward firing configuration.  Whenever it's been in the down firing configuration it would literally move around on my laminate floor.  When I put spikes on it the subfloor would literally vibrate with the volume turned up.  It's generally turned down low enough that it matters little, but I can get a lot more volume without house rattling when forward facing.

Try it all ways that’s the fun and it’s easy if it’s not huge.

agree.

sometimes we have to try things on our own 

Agree. Esp when the 2nd one arrives. Already getting ideas for positioning.

But yah I think I will change this one to front and see what happens.

I sure wish I hadn't sold my Gallos. 

You could also try firing it toward the wall pulled out about 2-3 inches. Sounds odd I know, but I've done this in the past with good results.

I’ve had both types, down firing and front, and truthfully I could easily be happy with either. Placement of the subs is the most important issue.