Comparing lounge furniture with yes armrests and melamine bases
Establish what the armrests contribute to the proposed arrangement. They may mark the ends of a sofa or the sides of an individual seat, depending on the furniture. Compare their actual outline and placement, keeping the intended approach to the seating clear within the room plan.
The presence of armrests does not identify whether they are fixed or adjustable. Treat those details as separate matters to verify where relevant. For this combination, the reliable starting points are the armrests themselves and the melamine base, considered together as visible parts of the complete seating design.
Relate the base to existing finishes
Use the actual appearance of the melamine base to assess its relationship with the room. The material selection does not specify a color, pattern, or surface treatment. Compare it with nearby architectural elements under the conditions in which the seating area will normally be seen.
Decide whether the base should recede within the composition or provide a noticeable visual connection between pieces. That decision depends on the base design and the surrounding finishes. It should follow an examination of the furniture itself, rather than an expectation that all melamine bases share a single appearance.

