The notion that the adverb only should always be placed next to the word in the sentence that it refers to is a superstition that runs counter to the natural position of such modifying words in English (compare often and usually). The typical position is between the subject and the verb in sentences such as I only drink wine at weekends and after an auxiliary verb in sentences such as I can only lend you a pound. (Compare I often drink wine at weekends and I can usually lend you a pound.) In ordinary conversation, the tone of voice makes it clear that only refers forward to the phrase at weekends and not more immediately to the words drink or wine, and that you do not mean (for example) I drink wine at weekends but I don't cook with it or I drink wine at weekends but not beer. In more formal written English, especially in legal documents, the position of only becomes more important, because in these contexts the language needs to be precise. So a contract, for example, might include the wording This penalty will be applied only if the contractor has been warned in writing at least three weeks in advance of the due date. But in ordinary English only would go after the verb will