Hidaren

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I asked an online answering site and they said:
Put your mohr(the clay you put your forehead on) on the handle/ or a table or something that enables you to do sojood and while you are in sojood put your hands on theh handles of your wheelchair or on the table beside the mohr.
If you are able put your feet tumbs on the earth, if it is possible, if not no need to do so.
It is common among all Marjas.
Take a look at these pics in this link, they are chairs made for those who cannot recite salah due to old age or disability, I hope looking at them can help you with reciting salah or maybe you might be able to create one for yourself  

Are you there?