There are many tengwar modes, and in most, but not all, vowels are marked with tehter. Such modes vary as to whether tehter are placed over the preceding tengwar or over the following tengwar, the latter seems to be favoured for writing languages were vowels are often word initial. At least one tengwar mode, by Tomáš Němec, for his native Czech has tehter over the following tengwar even though many Czech words end in vowels, which itself is largely because of case and gender. Here's a thought, if we put initial and medial tehter over the following tengwar, why not place word final tehter below the previous tengwar. I know that das Deutsche Tengwarmodum von Sebastian Basten does this with -e, but I was thing, could we do it with all word final vowels, and omit spaces between words. Similarly, if we juxtapose two vowels in consecutive syllables (as in words like poem, and the German word Beamter), maybe we could have one tehter below the preceding tengwar and another above the following one.
Tyoxt icx zigna xaqis kirml nuganip icxptoi.