Wall mounted makiwara doesn't have enough spring. (unless you figure out a way..like mounting it on top of a tire).
I stopped using wall makiwara for conditioning years ago, a bag without gloves is better. hitting stuff without much give, I believe, is more long-term damaging than helpful.
I still do use floor mount makiwara, but for training impact penetration and alignment.
just my opinion...
btw...Shureido is a top notch supplier, but even the best tool for the wrong job isn't necessarily a good investment.