If you do not have to worry about respondent using a smartphone display (small), then you may use the HTML flexbox feature.
<div style="display: flex; flex-wrap: wrap; justify-content: space-between;">
<img src="filename.jpg">
<img src="filename.jpg">
</div>
<div style="text-align: center">
<img src="filename.jpg">
</div>
Other methods like absolute positioning or HTML tables could be used as well.