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Is it a real fireplace? Like heat producing? We had a fireplace at our venue that was on the whole night but it was one of those modern-y wide accent ones that didn't produce heat. Ask your venue about that.
If the answer is yes (produces heat), then I wouldn't put your cake anywhere near it.
You could simply not have a fire in the fireplace and then place stuff wherever. Or if it's a natural, coved fireplace, see if the venue would let you put flameless candles in it - they wouldn't produce any heat, would still make the fireplace a focal point and you could put any tables wherever you want. Obviously the pic below is of someone's house but you get the idea:
Your floor plan looks cool but a couple of comments - I would put the photobooth and the video game outside where you have the popcorn/candy station. Then I'd move your DJ booth to that corner at an angle. Because keep in mind he/she has to stand behind that table and have space to set up their stuff. They need more space than you'd think. Then that frees up the wall the DJ booth is currently on so you can move your cake table if you want a real fire in the fireplace.
So knowing the new info, I would get rid of the rocking chairs on the porch so that you can have the video game and photo booth out there. I agree with @lyndausvi - if there's no one at the "DJ booth" and it's in that high traffic of an area, I can almost guarantee people will play with the equipment, use it to set their drinks down (maybe spill), etc. Just not good placement. If you free up that corner, you can put the DJ table over there no problem.
I saw the bat signal on "my" board and I was all
but now I'm disappointed. OP, it's considered rude around here for you to delete your posts. Especially when it's a perfectly tame thread with a reasonable question. Other users may have similar questions and your post could have helped.