Using please to create a stronger request is possible in spoken English but putting additional stress on the word please when speaking the sentence and changing the tone of speech. Obviously, this is more challenging to accomplish using only written English, and I don't think you can achieve that by changing only the position of the word within the sentence. Similarly, I don't think the politeness is altered by the location within the sentence.
On a side note, in spoken English, the methods of altering the politeness and strength of the request are essentially opposites of each other, so you would not be able to make it stronger and more polite at the same time (i.e. making the request stronger would make it inherently less polite because you are changing it from a request to a command).