to be honest its not really ideal but you can't have everything when you got space constraints.
You just have to use your ears and see if it sounds right. Would it awesome if you can get the volume sorted by a professional or someone with professional sound measuring stuff you can adjust the volume for each individual speaker as the Rear Right speaker seems to be so close to you the volume for that particular speaker needs to be reduced.... But as I said u gotta go with your ears.
Best to get a female to listen to it cause .. its been said that females have better listening than males.